Conor McGregor had strong words for Floyd Mayweather and Tenshin Nasukawa after their match was announced earlier this week by RIZIN for the Dec. 31 event in Saitama, and it didn’t take long for the Japanese star to respond.

Nasukawa, who is 27-0 in kickboxing and 4-0 in MMA, will face the boxing legend in a fight which the exact ruleset has yet to be announced, but vowed to “avenge” McGregor’s defeat to Mayweather.

Nasukawa last fought in September, defeating UFC veteran Kyoji Horiguchi in a kickboxing match in Japan. He takes on Mayweather next at RIZIN 14, which is scheduled for the Saitama Super Arena in Saitama, Japan.